Fludarabine, cyclophosphamide and 2 Gy TBI with PT-Cy as a single platform for haplo and unrelated donor allo-SCT in older AML or MDS patients
摘要
Allogeneic stem-cell transplantation (allo-SCT) is met with increased toxicity and relapse in elderly patients with acute myeloid leukemia (AML) or myelodysplastic syndrome (MDS). The nonmyeloablative conditioning (NMAC) regimen combining 2GyTBI, fludarabine, and cyclophosphamide (FluCyTBI) with post-transplant cyclophosphamide (PTCy) has been described as well adapted to AML/MDS patients aged ≥70yo in the haplo-identical setting. PTCy has then been implemented as basis for GVHD prophylaxis in allo-SCT with unrelated donors (UD). We here report our experience with a single FluCyTBI+PTCy platform for both haplo and UD allo-SCT in older AML or high-risk MDS patients. We retrospectively analyzed 203 patients transplanted at our center between 2015 and 2024. Median age at transplant was 69. Donors were haplo, mismatched UD, and matched UD in 64%, 18% and 18% of patients, respectively. Day+100 grade III-IV acute GVHD (aGVHD) and 3-y moderate/severe chronic GVHD (cGVHD) rates were 8% and 18%. Donor age ≥35yo was predictive of increased aGVHD III-IV and female-to-male sex-mismatch was associated with increased moderate/severe cGVHD. 3-y NRM rate was 15%. 3-y OS was 62%, with only monosomal karyotype predicting worse survival. FluCyTBI+PTCy is safe and produces promising outcomes in both haplo and UD settings. Beyond HLA-matching, non-HLA donor-related factors constitute critical determinants of patient outcome.